The details
Biography
Desan (died 355AD) was a bishop of the Christian Church.
He was a resident of Bizabda in Mesopotamia during the reign of Shapur II. He refused to worship the sun, and was on that basis transported to Persia where he was killed in 355. He was accompanied in martyrdom by a variety of others, including:
Heliodorus, another Christian bishop
Marjab, a Christian priest
Abdjesus, and 270 others.
They are all collectively commemorated with a feast day on April 9.